Onion (Spring planted) Growing Guide

Allium cepa

Onion (Spring planted)

Crop Rotation Group

Allium (Onion family) 


Fertile, well drained soil with compost dug in. In clay soil, grow in raised beds or rows.


Sun or partial shade.

Frost tolerant



Not normally required.


Single Plants: 15cm (5") each way (minimum)
Rows: 10cm (3") with 20cm (7") row gap (minimum)

Sow and Plant

Onions can be grown from seed in which case start in pots under cover in late winter before planting out in spring.
Our Garden Planner can produce a personalised calendar of when to sow, plant and harvest for your area.


Japanese variety onion sets can be used to give an early harvest.


Harvest as soon as they reach a reasonable size. If storing them, wait until the tops start to die down and dry for about 10 days. Not recommended in the tropics.


Weed early and often to keep onions growing strong. Seedlings are less likely to bolt (produce flowers) compared to bulb onions grown from sets.

Planting and Harvesting Calendar

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Pests which Affect Onion (Spring planted)

Plant Diseases which Affect Onion (Spring planted)